Exterior surface of a rear bumper for an automobile



FIG. 1 is a perspective view of an exterior surface of a rear bumper foran automobile according to my novel design;

FIG. 2 is a frontal view of an exterior surface of a rear bumper for anautomobile according to my novel design; and,

FIG. 3 is a left side view of an exterior surface of a rear bumper foran automobile according to my novel design.

The broken lines for illustrative purposes only and form no part of theclaimed design.

The ornamental design for an exterior surface of a rear bumper for anautomobile, as shown and described.